Page 223 - Shale Shakers Drilling Fluid Systems

ELECTRIC MOTORS 205

STARTER ENCLOSURES

TYPE NEMA ENCLOSURE
1 General Purpose—Indoor
2 Driproof—Indoor
3 Dusttight, Raintight, Sleettight—Outdoor
3R Raintight, Sleet Resistant—Outdoor
3S Dusttight, Raintight, Sleettight—Outdoor
4 Watertight, Dusttight, Sleet Resistant—Indoor & Outdoor
4X Watertight, Dusttight, Corrosion-Resistant—Indoor & Outdoor
5 Dusttight, Drip-Proof—Indoor
6 Occasionally Submersible, Watertight, Sleet Resistant—
Indoor & Outdoor
6P Watertight, Sleet Resistant—Prolonged Submersion—
Indoor & Outdoor
12 Dusttight and Driptight—Indoor
12K Dusttight and Driptight, with Knockouts—Indoor
13 Oiltight and Dusttight—Indoor
HAZARDOUS LOCATION STARTERS
7 Class I, Group A, B, C or D Hazardous
Locations—Indoor
8 Class I, Group A, B, C or D Hazardous Locations—
Indoor & Outdoor
9 Class II, Group E, F or G Hazardous Locations—Indoor
10 Requirements of Mine Safety and Health
Administration

CONVERSION OF NEMA TYPE NUMBERS
TO IEC CLASSIFICATION DESIGNATIONS
(Cannot be used to convert EC Classification Designations to NEMA Type Numbers)
NEMA ENCLOSURE IEC ENCLOSURE
TYPE NUMBER CLASSIFICATION DESIGNATION
1 IP10
2 IP11
3 IP54
3R IP14
3S IP54
4 and 4X IP56
5 IP52
6 and 6P IP67
12and12K IP52
13 IP54
Note: This comparison is based on tests specified in IEC Publication 529.
Reference: Information in the above tables is based on NEMA Standard 250-1991.

FIGURE 12-2
© 1997, Electrical Apparatus Service Association, Inc., St. Louis, MO. Reprinted with permission.